Dun Mill Lock is a lock on the Kennet and Avon Canal, near Hungerford, Berkshire, England.
Dun Mill Lock was built between 1718 and 1723 under the supervision of the engineer John Hore of Newbury. The canal is administered by British Waterways. The lock has a rise/fall of 5 ft 8 in (1.73 m).
It is a grade II listed building.
Coordinates: 51°24′42″N 1°29′46″W / 51.4117°N 1.4960°W / 51.4117; -1.4960